Fix Waterlevel description for issue1404 There might be a case for the wq_single description instead of getValueFromWQ but this works for a single W value and multiple W values and was the code formerly used for PDF export.

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END